Consider 3 national brands of apple pie (A, B, C), and a store brand (D) sold at a local grocery store. Past records show brands A and C were equally preferred, 30% preferred brand B, and 26% preferred the store brand, D. The manager believes that there has been a change in customer preferences and that the preference for store-brand apple pie has increased and perhaps will positively contribute to increased profits. Find the value of the appropriate test statistic for testing the change in customer preferences from the past years.

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